hello i got a larsen nmo 150/450/800 mhz antenna with a mag mount. and im picking up alot of what seems to be tv shows i turn my squelch up almost all the way before the interference stops. pluss im not picking up like i thank i should be i mean it does good but some times i can pick up static and then i put my factory antenna on it while its picking up static and i can here it fine and then other times it comes in a little better than the factory antenna i just bought this antenna and was just wondering if it was defective and then some one told me im loosing alot buy not having it grounded. im useing a mag mount with 12 feet of coax with a screw on bnc to hook up to my pro 164. i use it in the car and when im not riding i take it out and use it in the house. so what am i doing wrong? and what do i need to improve this to make it better? do i need to have it grounded.?